Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add victorzhong0110/skill-evolution --skill frontend-designgit clone --depth 1 https://github.com/victorzhong0110/skill-evolutionWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/victorzhong0110/skill-evolution/frontend-design)<a href="https://agentmods.dev/skills/victorzhong0110/skill-evolution/frontend-design"><img src="https://agentmods.dev/badge/skills/victorzhong0110/skill-evolution/frontend-design.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00049 | $0.00474 |
| Opus 5 | $0.00024 | $0.00237 |
| Sonnet 5 | $0.00010 | $0.00095 |
| Haiku 4.5 | $0.00005 | $0.00047 |
Grade A, and why
frontend-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Frontend Design
Write a short design plan before any markup. The plan is the deliverable the evolution tasks score; the code comes after the plan is unique to this brief.
1. Pin the subject
Name the product or page, who it is for, and the single job of the screen. If the brief is vague, choose a concrete subject and state the choice. Pull visual vocabulary from that subject's materials, tools, and vernacular — not from a generic "SaaS landing" template.
2. Token sheet (required)
Publish a compact token sheet in the plan:
- Palette — 4–6 named colors with hex values
- Type — a display face, a body face, and when needed a utility face for data
- Layout — one sentence plus a small ASCII wireframe
- Signature — the one element this page should be remembered by
Derive every later CSS choice from this sheet. Do not invent extra colors in code.
3. Refuse the three defaults
Unless the brief explicitly asks for one of them, do not ship:
- Warm cream background + terracotta accent + stock serif display
- Near-black canvas + a single acid-green or vermilion accent
- Broadsheet columns with hairline rules and zero radius used as decoration
If your first plan matches any of these, revise the palette or signature and say what you changed.
4. Copy is a design material
Interface words name what a person controls, not how the system is built.
Buttons say the action (Save changes, not Submit). Errors explain the
failure and the next step. Empty states invite an action.
5. Build after the plan
Implement from the token sheet. Keep selector specificity boring. Respect reduced-motion. Spend boldness on the signature; keep the rest quiet.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 54 lines · 49 tokens per session scan A 293198891b29
frontend-design is a skill published in the GitHub repository victorzhong0110/skill-evolution (11 stars, last pushed 2d ago), licensed MIT. It adds 49 tokens to every session and 474 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
claude-design
Design one-off HTML artifacts (landing, deck, prototype).
sketch
Throwaway HTML mockups: 2-3 design variants to compare.
popular-web-designs
54 real design systems (Stripe, Linear, Vercel) as HTML/CSS.
impeccable
Frontend design guidance, upstream-maintained (impeccable).
html-artifacts
Author the HTML for a plan artifact, dashboard iframe, or Slack attachment — structure, design plan, available runtime, theming, and craft. Read this before writing HTML for saveplan, outputiframe, or slackattachhtml.
web-design
Penguin visual language for generated web pages and app UIs — GitHub-style simplicity with a single blue accent, light and pure-black dark themes, design tokens, component and chat-interface recipes, plus an opt-in warm paper editorial theme.